<template>
  <div class="app-container">
    <el-form label-width="120px">
      <el-form-item label="信息描述">
        <el-tag type="info">excel模版说明</el-tag>
        <el-tag>
          <i class="el-icon-download"/>
          <a :href="'/static/subjectdemo/添加课程.xlsx'">点击下载模版</a>
        </el-tag>
      </el-form-item>
      <el-form-item label="选择Excel">
          <!-- auto-upload 自动提交  accept 文件类型 -->
        <el-upload
          ref="upload"
          :auto-upload="false"
          :on-success="fileUploadSuccess"
          :on-error="fileUploadError"
          :disabled="importBtnDisabled"
          :limit="1"
          :action="BASE_API+'/eduservice/subject/addSubject'"
          name="file"
          accept="application/vnd.ms-excel">  
          
          <el-button slot="trigger" size="small" type="primary">选取文件</el-button>
          <el-button
            :loading="loading"
            style="margin-left: 10px;"
            size="small"
            type="success"
            @click="submitUpload">{{ fileUploadBtnText }}</el-button>
        </el-upload>
      </el-form-item>
    </el-form>
  </div>
</template>

<script>
export default {
    data() {
    return {
        fileUploadBtnText:"上传到服务器",
        BASE_API: process.env.BASE_API, // 接口API地址
        importBtnDisabled: false, // 按钮是否禁用,
        loading: false
    }
  },
  created(){

  },
  methods:{
      //点击上传
       submitUpload() {
        this.fileUploadBtnText = '正在上传'
        this.importBtnDisabled = true
        this.loading = true
        this.$refs.upload.submit()
      },
    //上传成功事件 response为接口的返回值
        fileUploadSuccess(response){
            if (response.success === true) {
            this.fileUploadBtnText = '导入成功'
            this.loading = false
            this.$message({
                type: 'success',
                message: response.message
            })
            } 

        },
        //失败事件
        fileUploadError(response) {
            this.fileUploadBtnText = '导入失败'
            this.loading = false
            this.$message({
                type: 'error',
                message: '导入失败'
            })
    }

  }
}
</script>

<style>

</style>